Describes any contiguous amount of human excrement (generally in a coherent cable form) that may be partially submerged but surfaces on opposite sides of the bowl, touching dry porcelain on each end.
"Dude, my dude, just went coast-to-coast. Check it out."
Riding public transportation to the end of the line, getting kicked off, wait for the next bus/train/tram to come, get on then ride to the end of the line again and repeat.
This usually occurs when you are drunk and keep falling asleep and missing your stop. Also comes in handy when you don't have a place to sleep.
Craig: Did you hook up with that skeeve last night? You never came home.
Phil: No. We went clubbing then she didn't invite me back to her place. I just went coast-to-coast about 5 times.